{"id":3567,"date":"2017-04-03T11:19:10","date_gmt":"2017-04-03T05:49:10","guid":{"rendered":"https:\/\/www.wikitechy.com\/technology\/?p=3567"},"modified":"2017-04-03T11:19:10","modified_gmt":"2017-04-03T05:49:10","slug":"centos-7-dual-boot-with-windows","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/technology\/centos-7-dual-boot-with-windows\/","title":{"rendered":"CenTOS 7 dual boot with windows"},"content":{"rendered":"

Configuring Grub 2 on CentOS 7 to Dual Boot with Windows 7:<\/span><\/strong><\/h4>\n
    \n
  • Once you install CentOS 7 alongside your Windows OS, you may find that you cannot boot into Windows. The Grub bootloader may only show your Linux OS as your only options to boot from.<\/li>\n<\/ul>\n

    \"\"<\/p>\n

      \n
    • To fix this and have the Grub bootloader list your Windows OS, you need to edit the Grub bootloader files.<\/li>\n
    • If you have used CentOS is the past (with 6 or earlier), you may find that editing Grub is different. Previously, you would edit \/boot\/grub\/grub.conf.<\/li>\n
    • This is no longer the case, as the grub2.cfg file is generated dynamically, based on dependency files. Here\u2019s what you need to edit to configure your bootloader.<\/li>\n<\/ul>\n

        \n
      • Boot into CentOS 7.<\/li>\n<\/ul>\n

          \n
        • Determine what partition your Windows OS resides on by running sudo fdisk -l in Terminal.<\/li>\n<\/ul>\n
          Linux<\/span> <\/div> 
          Disk \/dev\/sda: 320.1 GB, 320072933376 bytes, 625142448 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical\/physical): 512 bytes \/ 512 bytes I\/O size (minimum\/optimal): 512 bytes \/ 512 bytes Disk label type: dos Disk identifier: 0xcd8b1219<\/code><\/pre> <\/div>\n[ad type=”banner”]\n
           
           Linux<\/span> <\/div> 
           Device Boot          Start              End              Blocks \t  Id  \tSystem \/dev\/sda1   *        2048          4194303       2096128   \t 7  \tHPFS\/NTFS\/exFAT \/dev\/sda2         4194304      360402758   178104227+           7              HPFS\/NTFS\/exFAT \/dev\/sda3       360402942   625141759   132369409              5               Extended \/dev\/sda5       612595712   625141759     6273024                82           Linux swap \/ Solaris \/dev\/sda6       360407040   361431039      512000                 83               Linux \/dev\/sda7       361433088   612589567   125578240              8e             Linux LVM<\/code><\/pre> <\/div>\n
          In this example, \/dev\/sda1 is the recovery partition, and \/dev\/sda2 is the Windows OS partition. Since partition indexes start at zero, the Windows OS partition will be `hd0,1` (a = 0, 2 = 1; or first disk, second partition) when we edit the Grub file. Make note of this.<\/p>\n
            \n
          • Open a terminal and navigate to \/etc\/grub.d\/:<\/li>\n<\/ul>\n
             
             Linux<\/span> <\/div> 
            cd  \/etc\/grub.d\/<\/code><\/pre> <\/div>\n
              \n
            • Edit the 40_custom file. You may not see the file if you ls in \/grub.d\/.<\/li>\n<\/ul>\n
               
               Linux<\/span> <\/div> 
              sudo nano 40_custom<\/code><\/pre> <\/div>\n
                \n
              • You should see the following in the nano text editor:<\/li>\n<\/ul>\n
                 
                 Linux<\/span> <\/div> 
                #!\/bin\/sh exec tail -n +3 $0 # This file provides an easy way to add custom menu entries.  Simply type the # menu entries you want to add after this comment.  Be careful not to change # the 'exec tail' line above.<\/code><\/pre> <\/div>\n
                  \n
                • Below the last #, type on a new line:<\/li>\n<\/ul>\n
                   
                   Linux<\/span> <\/div> 
                  menuentry "Windows 7" {         set root=(hd0,1)         chainloader +1         }<\/code><\/pre> <\/div>\n[ad type=”banner”]\n
                    \n
                  • Finally, run the following to apply the changes to the grub.cfg file:<\/li>\n<\/ul>\n
                     
                     Linux code<\/span> <\/div> 
                    grub2-mkconfig --output=\/boot\/grub2\/grub.cfg<\/code><\/pre> <\/div>\n
                      \n
                    • Once you reboot, you should see the option of booting into Windows 7.<\/li>\n
                    • If a default boot entry into Windows (or something else) is requested, then you need to edit the GRUB_DEFAULT in \/etc\/default\/grub:<\/li>\n<\/ul>\n
                       
                       Linux Code<\/span> <\/div> 
                      GRUB_DEFAULT="Windows 7"<\/code><\/pre> <\/div>\n","protected":false},"excerpt":{"rendered":"
                      CenTOS 7 dual boot with windows – Once you install CentOS 7 alongside your Windows OS, you may find that you cannot boot into Windows.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1699],"tags":[6529,6532,6522,6524,6528,6537,6525,6533,6530,6487,6490,6484,6527,6489,6488,6481,6483,6526,6539,6482,6534,6531,6542,6535,6538,6536,6541,6485,6486,6540,6523],"class_list":["post-3567","post","type-post","status-publish","format-standard","hentry","category-linux","tag-boot-centos-7-from-usb","tag-centos-7-boot-partition","tag-centos-7-dual-boot","tag-centos-7-grub","tag-centos-7-grub-install","tag-centos-7-installation-step-by-step","tag-centos-7-live-usb","tag-centos-7-manual","tag-centos-7-partition-scheme","tag-centos-add-windows-to-grub","tag-centos-windows-virtual-machine","tag-dual-boot-centos-6-and-centos-7","tag-dual-boot-centos-7","tag-dual-boot-centos-7-and-windows-7","tag-dual-boot-centos-and-ubuntu","tag-dual-boot-centos-windows-10","tag-dual-boot-windows-10-and-centos-6","tag-dual-boot-windows-10-and-centos-7","tag-dual-boot-windows-7-centos-7","tag-dual-boot-windows-8-and-centos-7","tag-grub-rescue-centos-7","tag-grub-update-centos-7","tag-how-to-dual-boot-windows-10-and-centos-7","tag-how-to-install-centos-7-from-usb","tag-how-to-install-centos-7-on-windows-7","tag-how-to-install-centos-7-step-by-step","tag-how-to-update-grub-in-centos-7","tag-install-centos-on-windows-7-virtual-machine","tag-install-windows-after-centos","tag-usb-boot-centos-7","tag-windows-10-centos-7-dual-boot"],"_links":{"self":[{"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/posts\/3567","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/comments?post=3567"}],"version-history":[{"count":0,"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/posts\/3567\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/media?parent=3567"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/categories?post=3567"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/tags?post=3567"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}